Updates README

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 Git subtree plugins
 ===================
 
+This repository contains the `git-subtree` plugin and two auxiliary
+plugins to make easier pushing and updating subtrees.
+
+## References
+
+* https://git-scm.com/book/en/v1/Git-Tools-Subtree-Merging
+* https://git.kernel.org/pub/scm/git/git.git/plain/contrib/subtree/git-subtree.sh
+
+## Licensing
+
 * git-subtree: distributed under GPLv2 (see COPYING).
 * other scripts: distributed under GPLv3 (see LICENSE).